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diff --git a/Doc/library/fcntl.rst b/Doc/library/fcntl.rst
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@@ -28,6 +28,10 @@ descriptor.
Operations in this module used to raise an :exc:`IOError` where they now
raise an :exc:`OSError`.
+.. versionchanged:: 3.8
+ The fcntl module now contains ``F_ADD_SEALS``, ``F_GET_SEALS``, and
+ ``F_SEAL_*`` constants for sealing of :func:`os.memfd_create` file
+ descriptors.
The module defines the following functions: